Research & Knowledge.
AI agents designed to search, synthesize, and surface information from the web, academic papers, and large corpora. Ranked by aggregate score from 4 published community and editorial evaluations. Top of this catalog: Perplexity, Elicit, Consensus.
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3.9Median /10
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PerplexityEditor's pickPerplexity AI · Free (limited daily Pro searches); Pro $20/mo; Teams $40/user/mo · BrowserPerplexity is the leading AI-powered search engine and research assistant, combining real-time web search with LLM synthesis to answer questions with cited sources. Its "Pro Search" and "Deep Research" modes can autonomously browse dozens of pages and produce structured research reports. With over 15 million monthly active users, Perplexity has become the default research tool for developers, researchers, and knowledge workers.BrowserEasy setupClaude SonnetRelFitEaseCost9.01 reviews02
ElicitElicit · Free (5000 papers/year); Plus $12/mo; Professional $50/mo · BrowserElicit is an AI research assistant specialized in academic literature, built to help researchers find, summarize, and extract data from scientific papers. Its "Elicit Notebook" enables systematic literature reviews by searching across 200M+ papers, extracting structured data into tables, and identifying research gaps. Elicit is the gold standard for academic researchers who need rigorous, evidence-based synthesis rather than general web search.BrowserEasy setupProprietary (Elicit models)RelFitEaseCost8.81 reviews03CConsensusConsensus · Free (20 searches/mo); Premium $8.99/mo; Teams $9.99/user/mo · BrowserConsensus is an AI search engine specifically designed to surface evidence from peer-reviewed scientific research, providing "Consensus Meters" that indicate how strongly the evidence supports a claim. Unlike general AI tools that may hallucinate citations, Consensus only references real papers and provides direct links to source documents. It is particularly valuable for health, nutrition, and science questions where evidence quality matters.BrowserEasy setupGPT-4oRelFitEaseCost0.00 reviews04
Exa AIExa · Free tier (1000 searches/mo); Pay-as-you-go $0.25/1000 requests; Enterprise custom · BrowserExa is a neural search API designed specifically for AI agents and developers, using embedding-based semantic search to find highly relevant content that keyword search misses. Unlike traditional search APIs, Exa excels at finding content that is conceptually similar rather than textually matching, making it ideal for research agents and RAG pipelines. Exa is increasingly embedded as the default web search tool in agentic frameworks like LangChain and CrewAI.BrowserEasy setupProprietary (Exa neural search models)RelFitEaseCost0.00 reviews
PerplexityEditor's pickPerplexity AI · Free (limited daily Pro searches); Pro $20/mo; Teams $40/user/mo · BrowserPerplexity is the leading AI-powered search engine and research assistant, combining real-time web search with LLM synthesis to answer questions with cited sources. Its "Pro Search" and "Deep Research" modes can autonomously browse dozens of pages and produce structured research reports. With over 15 million monthly active users, Perplexity has become the default research tool for developers, researchers, and knowledge workers.BrowserEasy setupClaude SonnetRelFitEaseCost9.01 reviews02ElicitElicit · Free (5000 papers/year); Plus $12/mo; Professional $50/mo · BrowserElicit is an AI research assistant specialized in academic literature, built to help researchers find, summarize, and extract data from scientific papers. Its "Elicit Notebook" enables systematic literature reviews by searching across 200M+ papers, extracting structured data into tables, and identifying research gaps. Elicit is the gold standard for academic researchers who need rigorous, evidence-based synthesis rather than general web search.BrowserEasy setupProprietary (Elicit models)RelFitEaseCost8.81 reviews03CConsensusConsensus · Free (20 searches/mo); Premium $8.99/mo; Teams $9.99/user/mo · BrowserConsensus is an AI search engine specifically designed to surface evidence from peer-reviewed scientific research, providing "Consensus Meters" that indicate how strongly the evidence supports a claim. Unlike general AI tools that may hallucinate citations, Consensus only references real papers and provides direct links to source documents. It is particularly valuable for health, nutrition, and science questions where evidence quality matters.BrowserEasy setupGPT-4oRelFitEaseCost0.00 reviews04Exa AIExa · Free tier (1000 searches/mo); Pay-as-you-go $0.25/1000 requests; Enterprise custom · BrowserExa is a neural search API designed specifically for AI agents and developers, using embedding-based semantic search to find highly relevant content that keyword search misses. Unlike traditional search APIs, Exa excels at finding content that is conceptually similar rather than textually matching, making it ideal for research agents and RAG pipelines. Exa is increasingly embedded as the default web search tool in agentic frameworks like LangChain and CrewAI.BrowserEasy setupProprietary (Exa neural search models)RelFitEaseCost0.00 reviewsCompare ready. Start with the top 3 visible agents.Compare